Work rest holder for centerless grinders



Sept. 14, 1948. c. KRUEGER 4 8 2 WORK REST HOLDER FOR CENTERLE SS GRINDERS Filed Oct. 15, 1947 2 Sheets-Sheet l INVENTOR. G7 Ida/0rd C. Aruefer a ZWFMY,

A TTORNEX Sept. 14, 1948. Y E. c. KRUEGER WORK REST HOLDER FOR CENTERLESS GRINDERS Filed Oct. 13, 1947 2 Sheets-Sheet 2 INVENTOR.

Edward C,

Patented Sept. 14, 1948 UNJIJEIEJD? ST 2,449,488 wonrrnnsrnomen FOR CENTERLESS GRINDERS Hawaii-WC; Krueger; Otsego; Mich-a, assignor to Hammond- Machinery Builders; Incorporated,

Kalamazoo; Mich":

Application OctoberlB, 1947, SerialINo. 77915307 Claims. I, This invention relatesto improvements in a work rest for a 'centerless grinder.

The principal "objects of'this invention are: First, to provide supportingmechanism forthe work restblude of a, centerless grinder which is quickly and accurately adjustable for. supporting a. wide range of sizes'of work pieces:

Second; to provide an adjustable support for the bladeiof'a' centerless grinder which; is easily and quickly adjustable for receiving difierent types of blades;

Third; to provide a. Work'rest for the Work restblad' of a; centerless grinder having "a continu-- ously variable adjustment and second. adjustment selectivelyvariable between two'positions.

Fourth; to'provid'e" a: novel clamping" {DC-C119,"

mice of the invention'will appear" from the descriptionto follow; The invention is definediin the claims.

The drawings; of which there are two sheets,

illustrate a, preferred form of my work rest mechanism= end two modified forms of *cletmpirug: mechanism associated Withthe work rest and blade:

Fig. lie 2, fragmentery'side elevationel view of'a, centerlessgrin-der with my work rest blade and clamp 'operativelyassociated, therewith.

Fig. Zrepresents an enlarged side; elevational viewof the Work rest illustrated in Fig, l and' indi-cates a range of adjustment of the 'WOTk"I6St" and blade;

Fig. 3 is a. front elevational view of mywvork' restpartially broken away 'to' illustrate the continuous-adjusting mechanism thereof;

Fig. 4 isa; fragmentary vertical cross sectional viewttlong the'line' F- l in Fig; 3.

Fig. 515 a perspective "view of the work rest blade clamp shown in Figslto 4.

Fig.- 6is an enlarged fragmentary vertical cross sectional viewshowing the Work rest'blade clamp in open position.

Fig. 'lis a. fragmentary side elevational view sive belt rotating inedjustableopposed relatiom:

, face of the holder plate 6.

2 ship to aregulzitin'g wheel 01" e-f'eedbeltl The workpiece is supported-between thegrindiirgele mentend th'o' regulatin W11001'Ol"b'1ll by-the" work rest so thatthe'grinding element and regulating wheel or'feed-belt engage 'the workpiece approximately at diametrically opposite sides of theworlc piece. ln'order to accommodate work pieces of different daimeterythe-grindingelement or the regulating wheel or th'e feed -be1t or both adjustable toward erra a-way fro meach'other to-receivevarious sized work pieces thereb'e tween. The work rest blade mustbe correspond ingly adjustable so'as to engage theunder side" of the Work piece slightly-01f center thereof and toward thegrihdihgelement; and at the same timeto support the work piece at approximately the samevertioal position relativete th center" of the grinding element;

In "the dial-wings;- fheve illustrated i an grinding element consisting of a wheel l and afee-d belt 2 rota-table around pair 'of feedbelt pulleys 3. Til-e feed belt 1 and grinding element oreadjust able Withrespect to each other to receive various sized' worh pieces t a ncl t A'=therebetWeen asris 'mostclarly shown in Fig." 2.

The workrest -lblad 5 -is secured to anholder plate Why the jaw--i of 2, clamp fi'lwhichwillbe more particularly described presently. The hold er plate is secured by means off thescrews 9' to: the verticalllfiange Ill of a slide member x I I The slide member H E is provided with a narrow de; pending Irib' l2 slidab1y mountedin slots or ways l3 on:theinclinediuppersurface of th'e base it. The base I 4 1s provi'ded' wvith laterally extending flanges: lfisr through which the screws it extend to secure the -vbasetoxa pair ofruils =1 l mounted oii tli'ebodyiotthe griz'idingmachine, a, portionof whichlisdl lustrated at lfi'i i I consideringinow the; details or. the jaw and clamp which tho-1d thetwork 'restflblade on the holder p'laite 6'5 attenitio n zis invitedrto Figs. 4, 5 and 6'. Thej ziw 'i' iconsists of the" upper leaf of an continuousie hinge, the lower :leaf 4 8 oil which i is! securedi as by spot welding to the. front sur The clamp 8 consists of airstrip oii'm'etel which lS' WBICiGdiESE atiilttb the'lowver edgezzof thezupper hinge leaf'i'so'as to be-rotateble therewith about the "hinge pin 2 ii The rear surface oftl'ie-c-lamp 8 defines a hori-- zonta'lly extending semi-cylindrical groove 22" which opens-towarctthe front oitheholder p1 ttebelowthe lowenhinge leaf- A cambar23-isprovided -wi-th down turned-handle section 24 (see Fig-.- 3) is positioned between the 'cla mp plate 8 and holdr plate z fi anel engaged in the groove 22. One side of the cam bar 23 is flattened as at 24 so that when the cam bar is rotated to present the flat surface 24 to the holder plate, the clamp plate 8 and upper jaw may be swung slightly away from the holder plate to release the blade 5. A blade of different material may then be easily dropped in place and clamped by turning the flattened surface of the cam bar out of registry with the holder plate 6. As is well known, different types of work pieces will require different types of materials in the blades and my clamping mechanism is well adapted to permit rapid change of the blades.

The slide member I I is adjustable on the base 14 by operation of a hand wheel 25 secured to the shaft 25 journaled in one side of the base. The inner end of the shaft 26 carries the beveled gear 27 meshing with the beveled gear 28 carried on the upper end of the screw shaft 29. The screw shaft 29 is journale'd in the depending ear 30 formed on the under side of the base and is threadingly engaged with the adjusting block 3| secured to the under side of the slide member II by the screws 32. The top surface of the base [4 defines an aperture 33 through which the screws 32 extend. A stamped metal cover 34 is provided for enclosing the bevel gears 27 and 28 and the screw shaft 29.

From the above description, it is apparent that the hand wheel 25 may be rotated to cause the slide member I I to move upwardly or downwardly along the inclined slide ways 13 of the base. Movement of the slide member will impart both vertical and longitudinal horizontal movement to the holder plate and the blade carried thereby and this movement is continuous or universal between the limits of movement of the block ill. The operator can accordingly position the work rest in any desired position relative to the grinding element and feed belt 2.

In order to provide a wider range of adjustment of the holder plate 6 and blade 5, I have provided the rails I? with two sets of tapped aper tures35 and 35-A for receiving the screws I6 clamping the base to the rails as is most clearly shown in Fig. 1. By positioning the base over either the apertures 35 or 35A, the positions of the work rest may be moved between a wide range of positions.

Since adjustment of the base l4 longitudinally on the rail I! will not have a corresponding vertical adjustment of the slide member and blade, I provide the vertical flange IU of the slide member with a second set of tapped apertures 36 arranged to receive screws 31 for clamping the modified holder plate 38 thereto. (See Fig. 7). The holder plate 38 defines the tapped apertures 39 for receiving the screws 40 to secure the alternate clamp bar H to the holder plate. The clamp bar M. carries a pair of set screws 42, the heads of which are adjustable to engage the front surface of the holder plate 38 and provide pivots about which the upper edge of the clamp bar 4| swings, clamping the blade 5 to the holder plate.

Should the operator of the machine desire to grind a work piece of large diameter, he has merely to move the base [4 to the holes 35-A in the rails and to substitute the holder plate 38 for the holder plate 6 on the vertical flange of the slide member II. The universally adjustable movement of the slide member is operative throughout its range of adjustment in either position of the base I4 so that the blades 5 may be located throughout a wide range of positions.

It will be noted that the slide member II is provided with forwardly projecting ears 43 at each end thereof which are tapped to receive the adjusting set screws 44, the heads of which are arranged to engage the lower edges of the holder plates 6 or 38. Each of the holder plates are provided with slotted recesses 45 for passing the shanksof the screws 4|] so that the holder plates may be conveniently leveled on the slide member or positioned at any desired angle.

I have thus described a highly practical commercial embodiment of my work rest so that others may reproduce the same with such modifications as desired without further disclosure.

Having thus described my invenion, what I claim as new and desire to secure by Letters Patent, is:

1. Structure for supporting a work rest blade between the grinding element and feeding element of a centerless grinder comprising a holder plate, a hinge having one leaf secured to said holder plate with the other leaf thereof acting as a jaw to clamp said blade to said plate, a clamp bar secured to said other leaf and defining a roove opposed to said holder plate, a, cam

rod positioned between said groove and said holder plate, said cam rod having a flattened surface adapted to permit opening of said jaw when said flattened surface is rotated into facing relationship with said holder plate, a slide member hav-- ing an upstanding flange to which said holder plate is secured, said holder plate defining slots adjustably receiving bolts for securing said plate to said flange, a base having an inclined surface I upon which said slide member is supported, a

screw carried by said base, bevel gears for rotating said screw, a, nut carried by said slide mem-v ber and engaged with said screw for adjusting the position of said slide member on the inclined surface of said base member, rail members secured to said grinder and arranged to support said base in a plurality of positions along said rail members, and vertically adjustable screws carried by said slide member and engaged with the under edge of said holder plate to adjust the position of said holder plate.

2. Structure for supporting a work rest blade between the grinding element and feeding element of a centerless grinder comprising a holder plate, a hinge having one leaf secured to said holder plate with the other leaf thereof acting as a jaw to clamp said blade to said plate, a clamp bar secured to said other leaf and defining a groove opposed to said holder plate, a cam rod positioned between said groove and said holder plate, a slide member having an upstanding flange to which said holder plate is secured, said holder plate defining slots adjustably receiving bolts for securing said plate to said flange, a base having an inclined surface upon which said slide member is supported, a screw carried by said base, bevel gears for rotating said screw, a nut carried by said slide member and engaged with said screw for adjusting the position of said slide member on the inclined surface of said base member, rail members secured to said grinder and arranged to support said base in a plurality of positions along said rail members, and vertically adjustable screws carried by said slide member and en gaged with said holder plate to adjust the position of said holder plate.

3. Structure for supporting a work rest blade between the grinding element and feeding element of a centerless grinder comprising a holder plate, a hinge having one leaf secured to said 1 ii holder plate with the other leaf thereof acting as a jaw to clamp said blade to said plate, a clamp bar secured to said other leaf and defining a groove opposed to said holder plate, a cam rod engaged between said groove and said holder plate for clamping said other leaf against said blade, a slide member having an upstanding flange to which said holder plate is secured,

a base having an inclined surface upon which said slide member is adjustably supported, and rail members secured to said grinder and arranged to support said base in a plurality of positions along said rail members.

4. Structure for supporting a work rest blade between the grinding element and feeding element of a centerless grinder comprising a holder plate, a hinge having one leaf secured to said holder plate with the other leaf acting as a jaw to clamp said blade to said plate, a clamp bar secured to said other leaf and opposed to said holder plate, a cam rod engaged between said bar andsaid holder plate for clamping said other leaf against said blade, a slide member having an upstanding flange to which said holder plate is secured, and a base having an inclined surface upon which said slide member is adjustably supported.

5. Structure for supporting a work rest blade between the grinding element and feeding element of a centerless grinder comprising a holder plate, a hinge having one leaf secured to said holder plate with the other leaf thereof acting as a jaw to clamp said blade to said plate, a clamp 6. Structure for supporting a work rest blade between the grinding element and feeding element of a centerless grinder comprising a holder plate, a hinge having one leaf secured to said holder plate with the other leaf thereof acting as a jaw to clamp said blade to said plate, a clamp bar secured to said other leaf and having a groove therein opposed to said holder plate, a cam rod engaged between said groove and said holder plate, and a slide member having an upstanding flange to which said holder plate is adjustably secured.

7. Structure for supporting a work rest blade between the grinding element and feeding element of a centerless grinder comprising a holder plate, a hinge having one leaf secured to said holder plate with the other leaf thereof acting as a jaw to clamp said blade to said plate, a clamp bar secured to said other leaf and having :a groove therein opposed to said holder plate, and a cam rod engaged between said groove and said holder plate.

8. Supporting structure for the work rest blade of a centerless grinder comprising, a base adjustably secured to said grinder, a slide member mounted for sliding adjustment on an inclined surface of said base, an upstanding flange on said slide member and defining vertically spaced pairs of apertures, a pair of holder plates adapted to be selectively secured to said flange by screws selectively engaging said apertures, a clamp including a hinge having one leaf thereof secured to one of said holder plates, and an alternate clamp secured to said other plate by screws adiustably engaging said other plate.

9. A work rest for a centerless grinder comprising a holder plate, a clamping plate disposed in opposed relationship to said holder plate along the upper portion of said holder plate and pivotally connected therewith, said clamping plate defining a horizontal groove opening to said holder plate below the pivotal connection thereof,

and a dam rod disposed in said groove between said plates and adapted when rotated to move the top of said clamping plate toward said holder plate to clamp a work rest blade between said plates.

10. A work rest for a centerless grinder comprising a holder plate, a clamping plate disposed 7 in opposed relationship to said holder plate along the upper portion of said holder plate and pivotally connected with said holder plate, and a cam rod disposed between said plates below the pivotal connection of said clamping plate and adapted when actuated to move the said clampin plate toward said holder plate to clamp a work rest blade between said plates.

EDWARD C. KRUEGER.

REFERENCES CITED The following referencesare of record inthe file of this patent:

UNITED STATES PATENTS Number Name Date 1,421,205 Fuller June 2'7, 1922 FOREIGN PATENTS Number Country Date 306,177 Great Britain Feb. 18, 1929 416,271 Great Britain Sept. 13, 1934 

